Sofa



FIG. 1 is a front perspective view of a sofa according to the present invention;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a side view thereof;

FIG. 4 is another side view thereof; and,

FIG. 5 is rear elevational view thereof. 

The ornamental design for a sofa, as shown and described. 